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김한성 ( Han Sung Kim ),김현종 ( Hyun Jong Kim ),안지은 ( Ji Eun Ahn ),한명근 ( M. K. Han ),복혜미 ( Hye Mi Bok ),강경륜 ( Kyung Ryun Kang ) 한국공업화학회 2010 응용화학 Vol.14 No.1
We described a cobalt/polypyrrole/carbon nanotube (Co/Ppy/CNT) as non-platinum catalysts for PEMFC. The Co/Ppy/CNT catalyst was characterized by XRD, TEM and XPS. The results showed that polypyrrole was well coated on the surface of CNT and cobalt ion was successfully stabilized on the nitrogen atoms of polypyrrole. The electrocatalytic activity was dependant on thermal treatment conditions. An onset potential of oxygen reduction reaction over Co/Ppy/CNT catalyst increased from 0.55 V to 0.78 V (NHE) after pyrolysis. Therefore, the interaction between cobalt ion and nitrogen atoms and pyrolysis process of catalyst should play and important role to enhance activity of catalyst.
민경원,김현종,한명근,류태우,김목순,주영환,Min, Kyoung-Won,Kim, Hyun-Jong,Han, M.K.,U, Yu-Tae,Kim, Mok-Soon,Chu, Young-Hwan 한국전기화학회 2008 한국전기화학회지 Vol.11 No.4
본 연구에서는 백금의 입자크기가 내구성과 활성에 미치는 영향을 고찰하였다. 상용 Pt/C의 열처리를 통해 백금 입자 크기를 $3.5{\sim}9\;nm$로 조절하였고, XRD와 TEM을 통해 이를 확인하였다. 촉매의 내구성 분석을 위해 가속 실험을 실시하였고, 촉매 활성 측정을 위해 산소환원반응 실험을 하였다. 백금의 입자크기를 증가시킬수록 내구성은 향상되었으나 촉매의 활성이 저하되었다. 즉 촉매의 내구성과 활성은 반비례관계가 성립된다는 것을 확인하였다. 그리고 저하된 촉매 활성과 내구성을 향상시키기 위해, 합금 촉매를 사용하였다.상용 Pt/C의 최대 전력 밀도는 약 $507.6\;mV/cm^2$ 이고, PtCo/C 합금촉매는 $585.8\;mV/cm^2$이었다. 전기화학적 표면적은 상용 Pt/C는 약 60%정도 감소하였고, PtCo/C 합금촉매는 약 24%정도의 감소율을 나타냈다. 따라서 백금의 입자 크기 조절과 합금화를 통해 백금의 내구성과 활성을 동시에 높일 수 있었다. The influence of the particle size of platinum(Pt) on the stability and activity was studied. The particle size of platinum was controlled in the range of $3.5{\sim}9\;nm$ by heat treatment of commercial Pt/C and confirmed by XRD and TEM. An accelerated degradation test was performed to evaluate the stability of platinum catalysts. Oxygen reduction reaction was monitored for the measurement of activity. As increasing the Pt particle size, the stability of Pt/C electrode was enhanced and the activity was reduced. It was confirmed that the stability of Pt/C electrode was in inverse proportion to the activity. PtCo/C alloy catalyst was used to improve the activity and stability of large-sized platinum particle. The maximum power density of commercial Pt/C was $507.6\;mV/cm^2$ and PtCo/C alloy catalyst was $585.8\;mV/cm^2$. The decrement of electrochemical surface area showed Pt/C(60%) and PtCo/C alloy catalyst(24%). It was possible to enhance both of stability and activity of catalyst by the combination of particle size control and alloying.
비대칭 하이브리드 커패시터 전극으로서의 전도성고분자-CNT 복합재료 합성 및 특성화
안지은 ( Ji Eun Ahn ),문지훈 ( Ji Hoon Moon ),김현종 ( Hyun Jong Kim ),한명근 ( M. K. Han ),설용건 ( Yong Gun Shul ),김성빈 ( Sung Bin Kim ) 한국공업화학회 2011 응용화학 Vol.15 No.1
Polypyrrole-CNT as supercapacitor was composed with MnO2-CNT for asymmetric hybrid capacitor. To improve the voltage characteristics were used of polypyrrole-CNT, compared to the conventional capacitor was ascertained that the high voltage range. Polypyrrole-CNT composite electrodes formed the peaks by the doping-dedoping for Li-ion.
알루미늄이 도핑 된 산화아연 나노입자의 합성에 관한 연구
신치호 ( Chi Ho Shin ),김현종 ( Hun Jong Kim ),이호년 ( Ho Yen Lee ),한명근 ( M. K. Han ),신태욱 ( T. W. Shin ),임병태 ( B. T. Lim ) 한국공업화학회 2010 응용화학 Vol.14 No.1
Zinc oxide (ZnO) has attracted much attention for a long time since it shows wide range of application such as ultra-violet absorbents, photocatalysts, photo-detector, and transistors, due to its wide band gap (3.37 eV) and large exciton binding energy (60 mV). Wide varieties of synthesis techniques have thus been developed to produce this material in different forms. They are, for instance, sol-gel process, hydrothermal process, hydrothermal process, and chemical vapor deposition. The wide band gap of ZnO can be reduced by controllably introducing non-stoichiometry and/or appropriate dopants for actual application in photocatalysts working at visible range. Recently, doping of ZnO could be achieved by replacing Zn2+ions with the ions of elements of higher valency such as Ga, Al, Co and In, or with the ions of transition metals, which was inducing drastic changes in its electrical and optical properties. ZnO and Aluminum doped ZnO particles were prepared by polyol process in different conditions. The effect of zinc concentration and dopant on structural, morphological, optical properties was investigated.
비백금 연료전지 촉매로서의 Co/PANi/CNT 합성 및 특성
이효준 ( Hyo June Lee ),안지은 ( Ji Eun Ahn ),김현종 ( Hun Jong Kim ),한명근 ( M. K. Han ),김한성 ( Hang Sung Kim ),이헌우 ( H. W. Lee ) 한국공업화학회 2011 응용화학 Vol.15 No.1
Platinum catalyst activity and stability is excellent in terms of fuel cells as a catalyst here. Although it is widely used, to compensate for the high price issue non-precious fuel cell catalysts are being developed. In this study, Co/PANi/CNT composite and non-precious as a catalyst for oxygen reduction was applied. Polyaniline on the interaction between cobalt and the oxygen reduction reaction and the structural characteristics observed in the impact and heat treatment was carried out according to the improved catalytic performance. Potential range is oxygen reduction reaction 0.55 V to 0.78 V(vs. NHE) after pyrolysis. Through this study, Co /PANi/CNT composites as a potential catalyst for fuel cells were non-precious.
g-C(3)N(4)기를 가진 카본나노튜브의 산소 환원 반응 특성
안지은 ( Ji Eun Ahn ),김현종 ( Hyun Jong Kim ),한명근 ( M. K. Han ) 한국공업화학회 2010 응용화학 Vol.14 No.2
g-C(3)N(4)/CNT as non-platinum catalysts was thermally synthesized for ORR catalyst. The key properties of CNT for electrochemical devices are good electrical conductivity and large surface area with high porosity. ORR onset potentials of g-C(3)N(4) and g-C(3)N(4)/CNT catalysts were approximately 0.64 V (NHE) and current density was 4.5 mA/cm(2). As increasing the thermal treatment up to 600℃ the catalytic activity was strikingly improved.
전도성 Al-ZnO (AZO) 나노입자의 광경화 투명 코전도성 Al-ZnO(AZO) 나노입자의 광경화 투명 코팅
김현종 ( Hyun Jong Kim ),신치호 ( Chi Ho Shin ),문정호 ( Jung Ho Moon ),한명근 ( M. K. Han ),임병태 ( B. T. Lim ),신태욱 ( T. W. Shin ) 한국공업화학회 2010 응용화학 Vol.14 No.2
Al-doped ZnO (AZO) nanoparticle was synthesized with the size of 100 nm and the sheet resistance of 445 kΩ/□ by polyol precess. The synthesized AZO nanoparticle was directly dispersed in iso-propyl alcohol to form a homogeneous solution. Then, it was mixed with photocurable acrylate monomer which was act as the both of binder and stabilizer, when the AZO was coated on the slide glass, it showed better transparency and conductivity than commercial one.
연료전지 전극막 제조를 위한 백금나노입자의 기체확산층 직접 전기증착에 관한 연구
김현종 ( Hyun Jong Kim ),안지은 ( Ji Eun Ahn ),손성호 ( Seong Ho Son ),이홍기 ( Hong Kee Lee ),한명근 ( M. K. Han ),이관주 ( Kwan Ju Lee ),주영환 ( Young Hwan Chu ) 한국공업화학회 2010 응용화학 Vol.14 No.2
The pulse electro-deposition processes created the nanostructured Pt cluster directly on the surface of gas diffusion layer (GDL). By localizing platinum on the surface of a gas diffusion layer (GDL), it is possible to decrease the thickness of the catalyst layer and increase the efficiency of platinum usage. The Pt cluster was well dispersed in GDL and composed of Pt nanosheet. The growth mechanism was carefully monitored. By increasing the current density for pulse electrodeposition, the size of Pt cluster was decreased, result in the enhancement of ESA.